This circuit was found in a Texas Instruments documentation from the 1980s. The circuit monitors engine temperature by warning of engine warm-up and warning when the fan is on.
This circuit was found in a 1994 publication. It can receive signals from the 3 to 20 MHz band,...
This circuit was obtained in a 1978 English magazine. This circuit is one of many that the reader...
With two operational amplifiers it is possible to make a flip-flop type R-S (Reset-Set), as shown...